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Changes in category would explain it too. E.g. if deaths that used to go reported as accidents, are now verified as murders.

Changes in living conditions make such shifts seem likely - increased observation of everybody in close quarters.

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IMO the most fascinating skew along those lines is how advances in emergency medicine are actually the primary cause of a drop in murder rates. Police take all the credit, but it's actually paramedics rolling up to the scene with a full trauma center in the back of the ambulance.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1124155/

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